Oversized centre hole and thin wall design allows use without removal of cones and locknutsInvestment cast and heat-treated for strength and durabilityOne-inch base fits end of SR-1, FRW-1 Park tools or simply an adjustable wrench or bench viceHigh strength tool steelFits 12-tooth internally-splined Record, Chorus, and Athena cartridge bottom brackets, and Campagnolo cassette hub lockringsCompatible with 11-speed lockrings